Research Papers

Dynamics of a Superconducting Linear Slider

[+] Author and Article Information
Ignacio Valiente-Blanco

Instituto Pedro Juan de Lastanosa,
Avenida de la Universidad 30,
Leganés E-28911, Spain
e-mail: ivalient@ing.uc3m.es

Jose-Luis Perez-Diaz

Dto. de Ingeniería Mecánica,
Universidad Carlos III de Madrid,
Butarque, 15,
Leganés E-28911, Spain

Efren Diez-Jimenez

Dto. de Ingeniería Mecánica,
Universidad Carlos III de Madrid,
Butarque, 15,
Leganés E-28911, Spain

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received May 29, 2013; final manuscript received October 20, 2014; published online November 14, 2014. Assoc. Editor: Philip Bayly.

J. Vib. Acoust 137(2), 021002 (Apr 01, 2015) (4 pages) Paper No: VIB-13-1183; doi: 10.1115/1.4028928 History: Received May 29, 2013; Revised October 20, 2014; Online November 14, 2014

In this paper, the dynamic behavior of a one degree-of-freedom (DOF) contactless linear slider based on superconducting magnetic levitation is experimentally analyzed. The device is intended for precision positioning of an optic mirror in cryogenic environments. Different prototypes of this device have been tested at cryogenic temperatures (77 K), and their mechanical behavior characterized in the sliding direction for forced and unforced oscillations. Experimental results reveal that the slider is self-stable at the initial equilibrium position and the dynamic behavior fits well an underdamped harmonic oscillator. Finally, the device showed great potential for horizontal vibration isolation, acting as a low-pass filter with a resonance at about 0.9 Hz.

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Fig. 1

Picture of the device: (1) YBaCuO superconductor disks; (2) slider PM; (3) coils; and (4) optic mirror cube

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Fig. 2

Sketch of the experimental setup: (1) YBaCuO superconductor disks; (2) slider, PM; (3) coils; (4) laser triangulator ILD 1402; (5) polished aluminum mirror cube; (6) lab-jack stand; (7) optic table; and (8) liquid nitrogen vessel. d: distance between the superconducting disks and HFC: height of field cooling.

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Fig. 3

Position X versus DC current in the coil for different values of d. T = 77 K and HFC = 3 mm in all cases.

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Fig. 4

Position X versus time for an unforced oscillation of the slider. T = 77 K, d = 84 mm, and HFC = 3 mm. Reference amplitude of the oscillation about 10 mm.

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Fig. 5

Power spectrum versus frequency of the Lomb-normalized periodogram of the signal in Fig. 4.

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Fig. 6

Speed versus position X of the slider is represented by gray line. The ideal response of a harmonic oscillator with ξ = 0.18 and ω0 = 0.93 is represented by the black dashed line.

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Fig. 7

Transmissibility versus frequency ratio. Displacement amplitude for f ∼0 Hz is approximately 2.3 mm. Dashed line represent transmissibility for a harmonic oscillator with ξ = 0.18 and ω0 = 0.93 Hz.




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